Abstract
Abstract. It explained that the quenching crack distribution characteristics and formation mechanism of the vehicle hub axles. Quenching crack of the vehicle hub axles was always the longitudinal crack and distributes in the inner wall .The crack was thin and long with the phenomena of crack cross and associated. The results of finite element simulation show that the internal stress value of the vehicle hub axles is up to 300Kgf / mm2 with the common action of the structure stress and heat stress, it is far more than 40MnBH steel tensile limit. This is the main reason of quenching crack. So for controlling quenching crack, it is need control raw materials, optimization of the quenching process and quenching medium replacement and so on.
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